Symptoms of poor server response time

 

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If we notice that server CPU utilization appears low, but client requests for static pages take a long time to service, our server may be running out of server threads to handle requests.

This situation results when we have more inbound requests than we have Apache threads to handle those requests. New connections queue in the TCP/IP stack listen queue wait for acceptance from an available thread. As a thread becomes available, it accepts and handles a connection off of the listen queue. Connections can take a long time to reach the top of the listen queue. When this condition occurs, the following error message will appear in the error log:

• "Server reached MaxClients setting, consider raising the MaxClients setting"

• "Server ran out of threads to serve requests. Consider raising the ThreadsPerChild setting"